Study on the thermal deformation behavior and microstructure of FGH96 heat extrusion alloy during two-pass hot deformation

Bin Fang; Gao-feng Tian; Zhen Ji; Meng-ya Wang; Cheng-chang Jia; Shan-wu Yang

doi:10.1007/s12613-019-1774-0

Volume 26 Issue 5

May 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(5): 657-663

Bin Fang, Gao-feng Tian, Zhen Ji, Meng-ya Wang, Cheng-chang Jia, and Shan-wu Yang, Study on the thermal deformation behavior and microstructure of FGH96 heat extrusion alloy during two-pass hot deformation, Int. J. Miner. Metall. Mater., 26(2019), No. 5, pp. 657-663. https://doi.org/10.1007/s12613-019-1774-0

Cite this article as:

Bin Fang, Gao-feng Tian, Zhen Ji, Meng-ya Wang, Cheng-chang Jia, and Shan-wu Yang, Study on the thermal deformation behavior and microstructure of FGH96 heat extrusion alloy during two-pass hot deformation, Int. J. Miner. Metall. Mater., 26(2019), No. 5, pp. 657-663. https://doi.org/10.1007/s12613-019-1774-0

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Research Article

Study on the thermal deformation behavior and microstructure of FGH96 heat extrusion alloy during two-pass hot deformation

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Corresponding author:
Zhen Ji E-mail: jizhen@mater.ustb.edu.cn
Received: 14 July 2018; Revised: 15 October 2018; Accepted: 19 October 2018

Abstract

Abstract

The change rules associated with hot deformation of FGH96 alloy were investigated by isothermal two-pass hot deformation tests in the temperature range 1050-1125℃ and at strain rates ranging from 0.001 to 0.1 s^-1 on a Gleeble 3500 thermo-simulation machine. The results showed that the softening degree of the alloy between passes decreases with increasing temperature and decreasing strain rates. The critical strain of the first-pass is greater than that of the second-pass. The true stress-true strain curves showed that single-peak dynamic recrystallization, multi- peak dynamic recrystallization, and dynamic response occur when the strain rate is 0.1, 0.01, and 0.001 s^-1, respectively. The alloy contains three different grain structures after hot deformation:partially recrystallized tissue, completely fine recrystallized tissue, coarse-grained grains. The small-angle grain boundaries increase with increasing temperature. Increasing strain rates cause the small-angle grain boundaries to first increase and then decrease.
- FGH96 super-alloy;
- two-pass hot deformation;
- microstructure;
- grain orientation

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